I was testing a few things around billing locally and my test accounts showed an expired subscription. That seemed weird, but maybe someone else was testing some things on that account?

No, the "payment" failed last month and the subscriptions were canceled as a result.

The payment failed because the credit card had expired.

And the credit card had expired because Stripe uses `4242 4242 4242 4242` as their default test credit card and I have learned to just type 4 and 2 until all the fields are filled in. So the expiration date was filled in as 4/24 a long time ago and last April was finally 4/24. :)

I can't be the only one, right?

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For future reference, here's the documentation about Stripe's test payment methods: https://docs.stripe.com/testing